You did it right! I am very proud to say that you did a great job (except, i hope you mounted that amp ) More Questions:
1. Did you sum the sub output and one channel? Or did you sum the left right and sub all at once??
2. If you adjust the zones on your stereo (driver, front, rear, all, etc) is the change in sub output audible?
3. Did you keep the factory sub connected?

 

thank you thank you lol, honestly I only used that setup for about a month and got rid of it because of too much bass so I never mounted that amp.

1. The LLC has 4input and 4 outputs. The sub took one channel, the front L & R speaker take two channel and I used a Y RCA cable to sum the front speakers into one and the sub is on a channel by itself.

2. Oh yes it will change the sub output. The reason is because I adjust the LLC according to my taste. I lowered the level from the sub input and increased input level for the two front speakers. THose of you have hooked up the sub using the sub output know that you get a huge amount of bass. It's so much that it gives you a headache.

3. At first I actually took the stock sub out of the car but after a while I put it back in. It actually sounds better with the stock sub in, I think since we are using the stock HU, there are missing signals supposed to be going into the sub. Hence the aftermarket sub plays with some missing note. The stock sub isn't loud but it fills up all the notes that suppose to be heard from the music.

 

tt061880, are you in south florida by any chance?

 

yes I do live in SF, I'm always in Boynton Beach/Deerfield/Coral Springs .

 

maybe you'd like to install the LOC on my IS i'd compensate you for your time of course

 

where are u located? I'll help you out for FREE .

 

South Florida... near Florida International University. might be a bit of a drive for you... so I'd be willing to drive out to you.